Xcode / iOS5：键盘出现时向上移动UIView

问题描述

当键盘显示时，我想提升视野。键盘（高度：216）应该用它的高度向上推动我的视线。这可以用一个简单的代码吗？

I'd like to move up my view, when the keyboard is shown. The keyboard (height: 216) should push up my view with it's height. Is this possible with a simple code?

推荐答案

移动视图 up ，只需更改其中心即可。首先，将原始版本保存在 CGPoint 属性中。

To move the view up, just change its center. First, keep the original one in a CGPoint property.

- (void)viewDidLoad
{
    ...
    self.originalCenter = self.view.center;
    ...
}

然后，当键盘出现时根据需要进行更改：

Then, change as needed when keyboard shows up:

self.view.center = CGPointMake(self.originalCenter.x, /* new calculated y */);

最后，在隐藏键盘时恢复它：

Finally, restore it when keyboard is hidden:

self.view.center = self.originalCenter;

根据需要添加动画糖

您有多种方法可以知道键盘何时出现。

You have more than one way to know when the keyboard appears.

观察 UIKeyboardDidShowNotification 通知。

/* register notification in any of your initWithNibName:bundle:, viewDidLoad, awakeFromNib, etc. */
{
    ...
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
    ...
}

- (void)keyboardDidShow:(NSNotification *)note
{
    /* move your views here */
}

与 UIKeyboardDidHideNotification 相反。

-OR -

实施 UITextFieldDelegate

在编辑开始/结束时检测以移动视图。

Detect when editing begin/end to move views around.

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    /* keyboard is visible, move views */
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    /* resign first responder, hide keyboard, move views */
}

根据您可能需要跟踪用户编辑的字段的实际文本字段，添加计时器以避免过多地移动视图。

Depending on the actual text fields you may need to track in which field is the user editing, add a timer to avoid moving views too much.

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